中南林业科技大学学报2025，Vol.45Issue(4)：87-97,11.DOI:10.14067/j.cnki.1673-923x.2025.04.008
立地指数及密度对杉木幼龄林凋落物分解特征和热值的影响
Site indices and densities on growth of young Cunninghamia lanceolata plantation influence of litter decomposition characteristics and calorific value
摘要
Abstract
[Objective]In order to explore the nutrient flow and energy cycling of young Cunninghamia lanceolata under site index and density,and to screen out the site index and stand density with the fastest nutrient and energy flow,which is of great significance for the sustainable management of young Cunninghamia lanceolata forest.[Method]The 7-year-old Cunninghamia lanceolata plantation in the Yongjiang area of Yong'an state-owned forest farm was selected as the experimental forest,and three site indices were set by two-factor complete random block design:16 site index(S),18 site index(E)and 20 site index(T).At the same time,three stand densities were set:1 200 plants·hm-2(12),1 500 plants·hm-2(15),1 800 plants·hm-2(18),and a total of 9 treatments(S12,S15,S18,E12,E15,E18,T12,T15,T18).[Result]The residue rate of litter in the nine treatments decreased with the decomposition time,among which E15 had the fastest litter decomposition,and the time required for 50%and 95%litter decomposition was the shortest,which were 1.22 and 5.26 years,respectively.With the passage of decomposition time,the litter C content showed a decreasing-rising-decreasing trend,the N content showed a decreasing trend,and the P content showed a fluctuating state.With the decomposition of litter,the calorific value of litter showed a fluctuating and decreasing trend in general.S18,E15 and T12 treated litter calorific value decomposition rate quickly,which can be seen that the calorific value of litter decreases quickly,which can promote energy return and circulation.[Conclusion]T12,E15 and T18 treatments resulted in faster nutrient release and energy flow in litter.关键词
杉木/凋落物/养分/热值Key words
Cunninghamia lanceolata/litter/nutrients/calorific value分类
农业科技引用本文复制引用
朱琴,关恒锋,杨浩,许祖元,曹光球,曹世江..立地指数及密度对杉木幼龄林凋落物分解特征和热值的影响[J].中南林业科技大学学报,2025,45(4):87-97,11.基金项目
国家重点研发计划项目(2021YFD2201302). （2021YFD2201302）
